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From "Uma Maheswara Rao G (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2185) HA: ZK-based FailoverController
Date Wed, 21 Dec 2011 18:57:31 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13174310#comment-13174310
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Uma Maheswara Rao G commented on HDFS-2185:
-------------------------------------------

Ok, Todd thanks for the clarification.
ZOOKEEPER-1080 is the one we used for our internal HA implementation. Many cases has been
handled based on the experiences ,testing and also running in production from last 6months.
That is also has State machine implementation as you proposed.
If you have some free go through once and if you find that is reasonable, we can take some
code from there as well.
Also i can help in preparing some part of the patches.

Thanks
Uma
                
> HA: ZK-based FailoverController
> -------------------------------
>
>                 Key: HDFS-2185
>                 URL: https://issues.apache.org/jira/browse/HDFS-2185
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Todd Lipcon
>
> This jira is for a ZK-based FailoverController daemon. The FailoverController is a separate
daemon from the NN that does the following:
> * Initiates leader election (via ZK) when necessary
> * Performs health monitoring (aka failure detection)
> * Performs fail-over (standby to active and active to standby transitions)
> * Heartbeats to ensure the liveness
> It should have the same/similar interface as the Linux HA RM to aid pluggability.

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